 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.editors.text;

 import org.eclipse.core.runtime.IStatus;

 import org.eclipse.jface.dialogs.DialogPage;
 import org.eclipse.jface.dialogs.IMessageProvider;

 /**
  * A utility class to work with IStatus.
  *
  * @since 3.1
  */
 public class StatusUtil {

     /**
      * Compares two instances of {@link IStatus}. The more severe is returned:
      * An error is more severe than a warning, and a warning is more severe
      * than OK. If the two statuses have the same severity, the second is returned.
      *
      * @param s1 a status object
      * @param s2 a status object
      * @return the more severe status
      */
     public static IStatus getMoreSevere(IStatus s1, IStatus s2) {
         if (s1.getSeverity() > s2.getSeverity())
             return s1;

         return s2;
     }

     /**
      * Finds the most severe status from a array of statuses.
      * An error is more severe than a warning, and a warning is more severe
      * than OK.
      *
      * @param status an array with status objects
      * @return the most severe status object
      */
     public static IStatus getMostSevere(IStatus[] status) {
         IStatus max= null;
         for (int i= 0; i < status.length; i++) {
             IStatus curr= status[i];
             if (curr.matches(IStatus.ERROR)) {
                 return curr;
             }
             if (max == null || curr.getSeverity() > max.getSeverity()) {
                 max= curr;
             }
         }
         return max;
     }

     /**
      * Applies the status to the status line of a dialog page.
      *
      * @param page the dialog page
      * @param status the status
      */
     public static void applyToStatusLine(DialogPage page, IStatus status) {
         String message= status.getMessage();
         switch (status.getSeverity()) {
             case IStatus.OK:
                 page.setMessage(message, IMessageProvider.NONE);
                 page.setErrorMessage(null);
                 break;
             case IStatus.WARNING:
                 page.setMessage(message, IMessageProvider.WARNING);
                 page.setErrorMessage(null);
                 break;
             case IStatus.INFO:
                 page.setMessage(message, IMessageProvider.INFORMATION);
                 page.setErrorMessage(null);
                 break;
             default:
                 if (message.length() == 0) {
                     message= null;
                 }
                 page.setMessage(null);
                 page.setErrorMessage(message);
                 break;
         }
     }
 }

